/*
 * Copyright (C) 2012 Markus Junginger, greenrobot (http://greenrobot.de)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package android.bus;

import java.util.ArrayList;
import java.util.List;

final class PendingPost {
	private final static List<PendingPost> pendingPostPool = new ArrayList<PendingPost>();

	Object event;
	Subscription subscription;
	PendingPost next;

	private PendingPost(Object event, Subscription subscription) {
		this.event = event;
		this.subscription = subscription;
	}

	static PendingPost obtainPendingPost(Subscription subscription, Object event) {
		synchronized (pendingPostPool) {
			int size = pendingPostPool.size();
			if (size > 0) {
				PendingPost pendingPost = pendingPostPool.remove(size - 1);
				pendingPost.event = event;
				pendingPost.subscription = subscription;
				pendingPost.next = null;
				return pendingPost;
			}
		}
		return new PendingPost(event, subscription);
	}

	static void releasePendingPost(PendingPost pendingPost) {
		pendingPost.event = null;
		pendingPost.subscription = null;
		pendingPost.next = null;
		synchronized (pendingPostPool) {
			// Don't let the pool grow indefinitely
			if (pendingPostPool.size() < 10000) {
				pendingPostPool.add(pendingPost);
			}
		}
	}

}